NC0024406_Permit Issuance_20190322

ROY COOPER
Governor
MICHAEL S. XEGA ill
Secretary
LINDA CULPEPPEt ?
Director
NORTH CAROLINA
Environmental Quality
March 21, 2019
Mr. Paul Draovitch, Senior Vice President EH&S
Duke Energy Carolinas, LLC
Mail Code: EC13K
P.O. Box 1006
Charlotte, NC 28201-1006
Subject: Final NPDES Permit Renewal
Permit NCO024406
Belews Creek Steam Station
Stokes County
Facility Class I
Dear Mr. Draovitch:
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly, we are forwarding the attached NPDES permit. This permit is issued pursuant to the
requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement
between North Carolina and the U.S. Environmental Protection Agency dated October 15, 2007
(or as subsequently amended).
The Final Permit contains the following significant changes from the Draft Permit:
• The requirement to install a physical -chemical treatment for the dewatering
phase was made mandatory to assure protection of the water quality standards
in the receiving stream.
• The flow limit of 5.0 MGD was added to the decanting phase to reduce volume
of the pollutants discharged to the receiving stream.
The final permit maintains the following significant changes identified in the letter sent on
December 27, 2018:
• The following monitoring parameters were eliminated (Internal Outfall 002) to be
consistent with the latest update to 40 CFR 423: Chlorides and TSS.
• The Technology Based Effluent Limits for Total Arsenic, Total Mercury, Total Selenium,
and Nitrate/nitrite as N were added to the permit (Internal Outfall 002) based on the
requirements in 40 CFR 423.
• The Decanting Special Conditions were added to Outfall 003, please see A. (3.).
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• Monitoring frequency for all parameters that were previously monitored Quarterly were
increased to Monthly with an exception of Toxicity (Outfall 003 — normal
operations/decanting), please see A. (3.).
• Instream Waste Concentration for Outfall 003 (normal operations/decanting) was
increased to 90% from 19% based on the re -consideration of the effluent channel status.
• The compliance dates for fly ash transport water (November 1, 2018) and bottom ash
transport water (May 31, 2021) were added to Outfall 003 in accordance with 40 CFR
423.
• The compliance date of November 1, 2020 for Technology Based Effluent Limits was
added to Internal Outfall 002 in accordance with 40 CFR 423.
• The Water Quality Based Effluent Limits for Chlorides, Sulfates, Total Aluminum, Total
Cadmium, Total Selenium, Total Arsenic, Total Lead, Ammonia, and Total Thallium
were added to the permit based on the results of Reasonable Potential Analysis (Outfall
003 — normal operations/decanting).
• A new internal Outfall 006A for the dewatering of the ash pond was added to the permit.
Please see Condition A. (4).
■ A separate effluent page for the new Retention Basin (Outfall 003A) was added to the
permit. Please see Condition A. (5.).
• A new Outfall for the new Retention Basin (Outfall 006) was added to the pen -nit. Please
see Condition A. (7).
• The Instream Monitoring Special Condition was added to the permit to monitor the impact
of the facility on the receiving stream. Please see Special Condition A. (22.),
• A new Outfall for the Toe Drain discharge (Outfall 111) was added to the permit. Please
see Condition A. (10.).
• Federal regulations require electronic submittal of all discharge monitoring reports
(DMRs) and program reports. The final NPDES Electronic Reporting Rule was adopted
and became effective on December 21, 2015. The requirement to begin reporting
discharge monitoring data electronically using the NC DWR's Electronic Discharge
Monitoring Report (eDMR) interne# application has been added to your final NPDES
permit. [See Special Condition A. (23.)]
For information on eDMR, registering for eDMR and obtaining an eDMR user account,
please visit the following web page: http://dpg.nc.gov/about/divisions/water-
resources/edmr.
For more information on EPA's final NPDES Electronic Reporting Rule, please visit the
following web site:
https://www.federalregister.gov/documents/2015/10/22/2015-2� 4/national-pollutant-
scharge-elimination-sy stem-np des -electronic -reporting -rule
• The turbidity limit was added to the permit (Outfall 003) to meet the state turbidity
standard per 15A NCAC 2B .0211(3) (k).
• Clean Water Act Section 316(b) special condition was updated. Please see Special
Condition A. (16.).
• A new outfall was added to the permit (Outfall 005). This is a former stormwater outfall
SW002, it consists of once through non -contact chiller water and stormwater. Please see
Condition A. (6).
Page 2 of 3

• A new internal outfall was added to the permit (Outfall 009) for the discharge of
domestic wastewater. Please see Condition A. (9.).
• A new outfall was added to the permit (Outfall 007) for the emergency spillway
discharge from the South Coal Basin. Please see Condition A. (8.).
• The Compliance Boundary special condition was added to the permit. Please see Special
Condition A. (25.). This special condition replaces Groundwater Well Construction and
Sampling special condition.
• An Applicable State Law special condition was added to the permit. Please see Special
Condition A. (26.).
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within
thirty (30) days following receipt of this letter. This request must be in the form of a written
petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-
6714). Unless such demand is made, this decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division
may require modification or revocation and reissuance of the permit. This permit does not affect
the legal requirements to obtain other permits which may be required by the Division of Water
Resources or any other Federal, State, or Local governmental regulations.
If you have any questions concerning this permit, please contact Sergei Chernikov at (919) 707-
3606 or via email at [e-mail].
Sincerely,
Linda Culpepper, Director
Division of Water Resources, NCDEQ
Hardcopy: NPDES Files
Central Files
E-copy: DWR/Winston-Salem Regional Office / Water Quality
US EPA Region 4
DWR/Aquatic Toxicology Branch/Susan Meadows
Page 3 of 3

Permit NCO024406
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended,
Duke Energy Carolinas, LLC
is hereby authorized to discharge wastewater from a facility located at the
Belews Creek Steam Station
3195 Pine Hall Road (NCSR 1908)
Belews Creek
Stokes County
to receiving waters designated as the West Belews Creek/Belews Lake (Outfalls 001,
005, and 007), unnamed tributary to the Dan River (Outfall 003 and Outfall 003A),
and Dan River (Outfall 006) in the Roanoke River Basin.
in accordance with effluent limitations, monitoring requirements, and other
applicable conditions set forth in Parts I, II, and III hereof.
This permit shall become effective March 25, 2019.
This permit and authorization to discharge shall expire at midnight on February 28, 2024.
Signed this day March 21, 2019.
-4 � ( -
Linda tulpepper, D ector
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 23

Permit NCO024406
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of
this permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the
exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements,
terms, and provisions included herein.
Duke Energy Carolinas, LLC is hereby authorized to:
1. Continue to discharge:
• Outfall 001: once through cooling water consisting of intake screen backwash,
recirculating cooling water, station equipment cooling water and once -through
cooling water. This outfall discharges to Belews Lake.
• Outfall 003: Ash Basin discharge consisting of waste streams from the power
house and yard holding sumps, ash contact water, chemical holding pond, coal
yard sumps, stormwater, treated domestic wastewater, remediated groundwater,
coal pile collection basins (collecting contact stormwater from coal piles),
emergency release of anhydrous ammonia, release of ammonia during quarterly
testing, seepage from coal ash pond, emergency overflows from the existing
effluent channels, emergency overflow from the retention basin, and treated FGD
wastewater from internal Outfall 002. This outfall discharges to Unnamed
Tributary (UT) to Dan River.
• Internal Outfall 002: FGD wastewater (discharging to ash pond).
• Outfall 003A/006. Upon completion of construction, discharge from the new
Lined Retention Basin. Basin will accept wastes from holding basin, ash contact
water, various sumps, coal pile runoff, stormwater runoff, cooling tower
blowdown, FGD wastewater, and various low volume wastes such as boiler
blowdown, oily waste treatment, wastes/backwash from the water treatment
processes, coal pile collection basins (collecting contact stormwater from coal
piles), plant area wash down water, cooling tower blowdown, equipment heat
exchanger water, remediated groundwater, emergency overflow (rain in excess of
designed storm event), toe drain (potential discharge to outfall 006 only),
emergency release of anhydrous ammonia, release of ammonia during quarterly
testing, and treated domestic wastewater. Outfall 003A discharges to UT to Dan
River via the Outfall 003. Upon completion of construction all waste streams
previous1y discharged to ash basin, will be re-routed to the new retention basin.
During the transition period, wastewater from the ash pond can also be
discharged from Outfall. 003. New Outfall. 006 will be constructed for the lined
retention basin within 2 years to replace Outfall. 003A. Outfall 006 will discharge
to Dan River, this Outfall will be used for dewaterinjg of the ash basin.
• Outfall 005. This is a former stormwater outfall SW002, consisting of once
through non -contact chiller water and stormwater. This outfall discharges to
Belews Lake.
• Internal Outfall 006A. This is a temporary internal outfall for dewatering of the
ash basin, it will discharge through new Outfall 006.
• Outfall 007 (lat. - 36016'51.604"; long. 80003'52.995"). This is an emergency
spillway for South Coal Basin. This outfall discharges to Belews Lake. The
spillway is designed for a flood greater than 100-year event. Sampling of this
spillway is waived due to unsafe conditions associated with sampling during
overflow events.
• Internal Outfall 009. Domestic wastewater plant. The wastewater from this outfall
discharges to UT to Dan River via Outfall 003 or to Dan River via new Outfall 006.
Page 2 of 23

Permit NC0024406
Toe Drain Outfall 111 (lat. - 36017'54.94"; long. - 80.04'32.57"). Potentially
contaminated toe drain. This outfall discharges to UT to Dan River.
Internal Outfall 006A. Dewatering of the ash pond. This outfall discharges to Dan
River via new Outfall 006.
From a facility located at Belews Creek Station, 3195 Pine Hall Road (NCSR 1908),
Belews Creek in Stokes County, and
2. Discharge wastewater from said treatment works at the location specified on the
attached map into Belews Lake, and the UT Dan River/Dan River, which are
classified C and WS-IV waters, respectively, in the Roanoke River Basin.
Page 3 of 23

Permit NCO024406
Part I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 001)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge once -through cooling water and intake screen backwash from
Outfall 001. Such discharges shall be limited and monitored3 by the Permittee as specified below:
PARAMETER
LIMITS
MONITORING REQUIREMENTS
Daily Average
Daily
Maximum
Measurement
Frequent
Sample Type
Sample Location'
Flow
Continuous
Pump Logs
Effluent
Temperature oC
Daily
Recorder/Grab
Upstream
Temperature OC
Daily
Recorder/Grab
Downstream 1
Temperature OC 2
32oC
Daily
Recorder/Grab
Downstream 2
Temperature OC
Daily
Recorder/Grab
Effluent
Notes:
1. Sampling locations: Upstream - Upstream at Southern Railroad crossing of Belews Creek OR
East Belews Creek (site 405 or site 419), Downstream - Downstream at the discharge from the
Dam, approximately 5.3 miles from the outfall (Downstream 2), and approximately 0.5 miles
downstream of Outfall 001 (Downstream 1). Upstream and downstream temperature samples are
to be measured one foot below the surface.
2. In no case shall the ambient temperature exceed 32oC as a result of Belews Creek Steam
Station operations. The ambient temperature shall be defined as the daily average downstream
(Downstream 2) discharge water temperature. In cases where the Permittee experiences
equipment problems and is unable to obtain daily temperatures from the existing temperature
monitoring system, monitoring must be reestablished within five working days. Temperature
monitoring is required only when a discharge from the Lake Dam occurs.
3. Please See Special Condition A. (23.).
Chlorination of the once through condenser cooling water and/or auxiliary cooling water,
discharged through Outfall 001, is not allowed under this permit. Should Duke Energy wish to
chlorinate its condenser cooling water, a permit modification must be requested and received
prior to commencing chlorination.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 23

Permit NC0024406
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Internal
Outfall 002)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge from Internal Outfall 002 (treated FGD wet scrubber
wastewater to ash settling basin). Such discharges shall be limited and monitored' by the Permittee
as specified below:
PARAMETER
LIMITS
I MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequenc
Sample Type
Sample Location
Flow, MGD
Weekly
Pump Logs or similar
readings
Effluent
Total Arsenic
8.0 /L2
11.0 /L2
Quarterly
Grab
Effluent
Total Mercur 3
356.0 n IL2
788.0 n /L2
Quarterly
Grab
Effluent
Total Selenium
12.0 vqIL2
23.0 pqlU
Quarterly
Grab
Effluent
Nitrate/nitrite as N
4.4 m IL2
17.0 m IL2
Quarterly
Grab
Effluent
Oil and Grease
15.0 IL
20.0 m /L
Quarterly
Grab
Effluent
Total Suspended Solids
30.0 m /L
50.0 m IL
Quarterly
Grab
Effluent
Notes:
1. Please See Special Condition A. (23.).
2. In accord with the Steam Electric Effluent Limitations Guidelines for FGD wastewater (40 C.F.R.
423), these limits shall become effective on November 1, 2020. This permit may be reopened and
modified if changes are made to 40 C.F.R. 423.
3. The facility shall use EPA method 1631E.
All flows shall be reported on monthly DMRs, should no flow occur during a given month, the words
"No Flow" shall be clearly written on the front of the DMR. All samples shall be of a representative
discharge.
Page 5 of 23

A. (3.) EFFLUENT LIMITATIONS AND MONITORING
003 - normal operations/decanting)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Permit NC0024406
REQUIREMENTS (Outfall
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge from Outfall 003 Ash settling basin (decanting the free water
above the settled ash layer that does not involve mechanical disturbance of the ash). Such
discharges shall be limited and monitored5 by the Permittee as specified below:
PARAMETER
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
I Maximum
Measurement
Frequency
Sample Type
Sample Location
Flow
5.0 MGD
Weekly
Pump logs or
estimate
Effluent
Oil and Grease'
15.0 m /L
20.0 m /L
Monthly
Grab
Effluent
Total Suspended Solidsl,7
30.0 m /L
50.0 m /L
Monthly
Grab
Effluent
Total Arsenic
10.0 /L
340.0 /L
Monthly
Grab
Effluent
Chlorides
250.0 m /L
250.0 m /L
Monthly
Grab
Effluent
Sulfates
250.0 m /L
250.0 m /L
Monthly
Grab
Effluent
Total Iron10
1.0 m /L
1.0 m /L
Monthly
Grab
Effluent
Total Copper
1.0 m /L
1.0 m /L
Monthly
Grab
Effluent
Total Aluminum
6.5 /L
6.5 m /L
Monthly
Grab
Effluent
Total Cadmium
0.59 /L
3.24 /L
Monthly
Grab
Effluent
Total Selenium
5.0 /L
56.0 /L
Monthly
Grab
Effluent
Total Zinc, /L
Monthly
Grab
Effluent
Total Chromium, /L
Monthly
Grab
Effluent
Total Dissolved Solids, m /L
Monthly
Grab
Effluent
Total Silver, /L
Monthly_Grab
Effluent
Fluoride, m /L
Monthly
Grab
Effluent
Total Phosphorus, m /L
Monthly
Grab
Effluent
Total Nitrogen NO2 + NO3 + TKN , m /L
Monthly
Grab
Effluent
Chronic ToxiCity2
Quarterly
Grab
Effluent
pH3,8
2/Month
Grab
Effluent
Bromides, m /L
Monthly
Grab
Effluent
Total Lead
2.94 /L
75.48 /L
Monthly
Grab
Effluent
Total Thallium
2.0 /L
2.0 /L
Monthly
Grab
Effluent
Total Mercu 4, n /L
Monthly
Grab
Effluent
Turbidity', NTU
Monthly
Grab
Effluent
Total Hardness, m /L
Monthly
Grab
Effluent
Ammonia9
1.0 m /L
5.0 m /L
Variable
Grab
Effluent
Notes:
1. Monitoring for TSS, oil and grease and all toxicants shall be performed concurrently with the
Chronic Toxicity test.
2. Whole Effluent Toxicity shall be monitored by chronic toxicity (Ceriodaphnia) P/ F at 90%. See
Condition A. (14.) for details.
3. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
4. The facility shall employ method 1631E.
5. Please See Special Condition A. (23.).
6. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50
NTU. If the instream turbidity exceeds 50 NTU due to natural background conditions, the
discharge cannot cause turbidity to increase in the receiving stream. Therefore, if the effluent
measurement exceeds 50 NTU, the Permittee shall sample upstream and downstream turbidity in
the receiving waterbody, within 24 hours, to demonstrate the existing turbidity level in the
receiving waterbody was not increased. All data shall be reported on the DMRs. (See 15A NCAC
2B .0211 (21)).
Page 6 of 23

Permit NCO024406
NTU - Nephelometric Turbidity Unit.
7. The facility shall continuously monitor TSS concentrations when the decanting process
commences and the decanting pump shall be shutoff automatically when one-half of the Daily
Maximum limit (15 minutes average) is exceeded. Pumping will be allowed to continue if
interruption might result in a dam failure or damage. The continuous TSS monitoring is only
required when the pumps are employed for decanting.
8. The facility shall continuously monitor pH when the decanting process commences and the
decanting pump shall be shutoff automatically when the 15 minutes running average pH falls
below 6.1 standard units or rises above 8.9 standard units. Pumping will be allowed to continue
if interruption might result in a dam failure or damage. The continuous pH monitoring is only
required when the pumps are employed for decanting.
9. Ammonia limit and monitoring is only applicable in the event of the emergency release of
anhydrous ammonia. The sampling should be commenced as soon as possible after the release
considering personnel safety and every hour thereafter until the sampling indicates no discharge
of ammonia.
10. The limit applies only when the chemical metal cleaning waste is being discharged to the basin.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Outfall sampling shall be conducted prior to the commingling of wastewater from Outfall
003A.
The facility is allowed to drawdown the wastewater in the ash pond to no less than three feet
above the ash. The rate for lowering the liquid level in a coal ash pond shall not exceed one (1)
foot per day unless a higher rate is supported to the satisfaction of DEMLR and in accordance
with NCAC, Title 15A, Subchapter 2K.
The facility shall use a floating pump suction pipe with free water skimmed from the basin
surface using an adjustable weir. The limits and conditions in Section A. (4.) of the permit
apply when water in the ash settling basin is lowered below the three feet trigger mark.
By November 1, 201S there shall be no discharge of pollutants in fly ash transport water. This
requirement only applies to fly ash transport water generated after November 1, 201S.
By May 31, 2021 there shall be no discharge of pollutants in bottom ash transport water. This
requirement only applies to bottom ash transport water generated after May 31, 2021.
The facility shall notify via e-mail the DWR Complex NPDES Permitting Unit and the DWR
Winston-Salem Regional Office seven calendar days prior to the commencement of the
decanting.
In accordance with the N.C.G.S. § 130A-309.210, by December 31, 2019, the facility shall
convert to the disposal of dry bottom ash, as defined in the Coal Ash Management Act
("CAMA").
Page 7 of 23

Permit NCO024406
A. (4.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Internal
Outfall 006A - dewatering)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the commencement of dewatering and lasting until expiration of
the permit, the Permittee is authorized to discharge from Outfall 006A Ash settling basin
(Dewatering — removing the interstitial water). Such discharges shall be limited and monitored5
by the Permittee as specified below:
PARAMETER
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample Type
Sample Location
Flow
2.0 MGD11
Daily
Pump logs or
estimate
Effluent
Oil and Grease'
15.0 m /L
20.0 m /L
Weekly
Grab
Effluent
Total Suspended Solids'.7
30.0 m /L
50.0 m /L
Weekly
Grab
Effluent
Total Arsenic
Weekly
Grab
Effluent
Chlorides, m /L
Weekly
Grab
Effluent
Total Iron, m /L10
1.0 m /L
1.0 m /L
Weekly
Grab
Effluent
Total Copper
211.3 /L
231.4 IL
Weekly
Grab
Effluent
Total Selenium
134.0 /L
1,237 /L
Weekly
Grab
Effluent
Total Molybdenum
4,289 /L
4,289 /L
Weekly
Grab
Effluent
Total Aluminum
174.2 m /L
174.2 m /L
Weekly
Grab
Effluent
Fluoride, m /L
Weekly
Grab
Effluent
Chromium VI, /L
Weekly
Grab
Effluent
Total Cadmium, /L
Weekly
Grab
Effluent
Total Zinc, /L
Weekly
Grab
Effluent
Total Nickel, p /L
Weekly
Grab
Effluent
Total Dissolved Solids, m /L
Weekly
Grab
Effluent
Total Phosphorus, m /L
Monthly
Grab
Effluent
Total Nitrogen NO2 + NO3 + TKN , /L
Monthly
Grab
Effluent
Chronic Toxicit 2
Monthly
Grab
Effluent
H3.8
Weekly
Grab
Effluent
Bromides, m /L
Weekly
Grab
Effluent
Total Lead
78.9 /L
1,668 /L
Weekly
Grab
Effluent
Total Thallium, /L
Weekly
Grab
Effluent
Total Barium, m /L
Weekly
Grab
Effluent
Sulfates, m /L
Weekly
Grab
Effluent
Total Antimony, /L
Weekly
Grab
Effluent
Total Mercu 4, n /L
Weekly
Grab
Effluent
Turbidity6, NTU
Weekly
Grab
Effluent
Total Hardness, m /L
Weekly
Grab
Effluent
Ammonia9
1.0 m /L
5.0 m /L
Variable
Grab
Effluent
Notes:
1. Monitoring for TSS, oil and grease and all toxicants shall be performed concurrently with the
Chronic Toxicity test.
2. Whole Effluent Toxicity shall be monitored by chronic toxicity (Ceriodaphnia) P/F at 3.7%. See
Condition A. (14.) for details.
3. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
4. The facility shall employ method 1631E.
5. Please See Special Condition A. (23.).
6. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU.
If the instream turbidity exceeds 50 NTU due to natural background conditions, the discharge
cannot cause turbidity to increase in the receiving stream. Therefore, if the effluent measurement
exceeds 50 NTU, the Permittee shall sample upstream and downstream turbidity in the receiving
Page 8 of 23

Permit NCO024406
waterbody, within 24 hours, to demonstrate the existing turbidity level in the receiving waterbody
was not increased. All data shall be reported on the ❑MRs. [See 15A NCAC 213 .0211 )21)).
NTU - Nephelometric Turbidity Unit.
7. The facility shall continuously monitor TSS concentrations when the dewatering process
commences and the dewatering pump shall be shutoff automatically when one-half of the Daily
Maximum limit (15 minutes average) is exceeded. Pumping will be allowed to continue if
interruption might result in a dam failure or damage. The continuous TSS monitoring is only
required when the pumps are employed for dewatering.
8. The facility shall continuously monitor pH when the dewatering process commences and the
dewatering pump shall be shutoff automatically when the 15 minutes running average pH falls
below fi_ 1 standard units or rises above 8.9 standard units. Pumping will be allowed to continue if
interruption might result in a dam failure or damage. The continuous TSS monitoring is only
required when the pumps are employed for dewatering.
9. Ammonia limit and monitoring is only applicable in the event of the emergency release of
anhydrous ammonia. The sampling should be commenced as soon as possible after the release
considering personnel safety and every hour thereafter until the sampling indicates no discharge
of ammonia.
10. The limit applies only when the chemical metal cleaning waste is being discharged to the basin.
11. The flow limit is only applicable to interstitial water.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Outfall sampling shall be conducted prior to the commingling of wastewater from Outfall
003A.
The rate for lowering the liquid level in a coal ash pond shall not exceed one (1) foot per day
unless a higher rate is supported to the satisfaction of DEMLR and in accordance with NCAC,
Title 15A, Subchapter 2K.
The facility shall use a floating pump suction pipe with free water skimmed from the basin
surface using an adjustable weir. By November 1,,2018 there shall be no discharge of
pollutants in fly ash transport water. This requirement only applies to fly ash transport water
generated after November 1, 2018.
By May 31, 2021 there shall be no discharge of pollutants in bottom ash transport water. This
requirement only applies to bottom ash transport water generated after May 31, 2021.
The facility shall notify via e-mail the DWR Complex NPDES Permitting Unit and the DWR
Winston-Salem Regional Office seven calendar days prior to the commencement of the
dewatering.
In accordance with the N.C.G.S. $ 130A-309.210, by December 31, 2019, the facility shall
convert to the disposal of dry bottom ash, as defined in the Coal Ash Management Act
("CAMA").
All wastewater generated by the dewatering pumps shall be treated using physical -chemical
treatment, except that following a storm event that results in an increase of the water level in
the ash basin at least 800 gallons per minute will be treated by the physical -chemical
treatment system until the water is lowered to pre -storm levels. Duke Energy shall notify the
DWR NPDES Permitting and the DWR Winston-Salem Regional Office, in writing, within seven
calendar days of installing additional physical -chemical treatment at this Outfall.
If any one of the pollutants (As, Se, Hg, Ni, and Pb) reaches 85% of the allowable monthly
average discharge concentration during dewatering, the facility shall immediately discontinue
discharge of the wastewater and report the event to the DWR Winston-Salem Regional Office
and the DWR Complex NPDES Permitting via telephone and e-mail.
Page 9 of 23

Permit NC0024406
A. (5.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall
003A)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning upon the commencement of operations of the new Lined Retention
Basin and lasting until expiration, the Permittee is authorized to discharge from Outfall 003A (new
lined retention basin). Such discharges shall be limited and monitored2 by the Permittee as specified
below:
PARAMETER
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Flow, MGD
Weekly
Instantaneous
Effluent
Oil and Grease
15.0 m /L
20.0 m /L
Quarterly
Grab
Effluent
Total Suspended Solids
30.0 m /L
50.0 m /L
Quarterly
Grab
Effluent
pH3
Weekly
Grab
Effluent
Total Arsenic
10.0 p /L
340.0 /L
Quarterly
Grab
Effluent
Total Mercury', n /L
Quarterly
Grab
Effluent
Total Selenium
5.0 /L
56.0 /L
Monthly
Grab
Effluent
Nitrate/nitrite as N, m /L
Quarterly
Grab
Effluent
Chlorides
250.0 m /L
250.0 m /L
Monthly
Grab
Effluent
Sulfates
250.0 m /L
250.0 m /L
Monthly
Grab
Effluent
Total Aluminum
6.5 m /L
6.5 m 1L
Monthly
Grab
Effluent
Total Nickel, /L
Quarterly
Grab
Effluent
Bromides, m L
Quarterly
Grab
Effluent
Fluoride, /L
Quarterly
Grab
Effluent
Total Barium, m /L
Quarterly
Grab
Effluent
Total Chromium, /L
Quarterly
Grab
Effluent
Total Cadmium /L
0.59 /L
3.24 u /L
Monthly
Grab
Effluent
Total Hardness, /L
Quarterly
Grab
Effluent
Total Copper
1.0 m /L
1.0 m /L
Monthly
Grab
Effluent
Total Lead
2.94 !L
75.48 /L
Monthly
Grab
Effluent
Total Thallium
2.0 /L
2.0 /L
Monthly
Grab
Effluent
Chronic ToxiCity4
Quarterl
Grab
Effluent
Ammonia5
1.0 m /L
5.0 m /L
Dail
Grab
Effluent
Total Irons
1.0 m !L
1.0 m /L
Quarterly
Grab
Effluent
Notes:
1. The facility shall use EPA method 1631E.
2. Please See Special Condition A. (23.).
3. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
4. Whole Effluent Toxicity shall be monitored by chronic toxicity (Ceriodaphnia) P/F at 90%. See
Condition A. (14.) for details.
5. Ammonia limit and monitoring is only applicable in the event of the emergency release of
anhydrous ammonia.
6. The limit applies when the chemical metal cleaning waste is being discharged to the basin.
The facility shall complete and submit EPA Form 2C for this Outfall within 2 years of
commencement of the discharge.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Outfall sampling shall be conducted prior to the commingling of wastewater from Outfall 003.
The facility shaU use polymer addition as needed to achieve compliance with the permit limits
for the Lined Retention Basin.
Page 10 of 23

Permit NCO024406
A. (6.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 005)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge once -through non -contact chiller water and stormwater from
Outfall 005. Such discharges shall be limited and monitored' by the Permittee as specified below:
PARAMETER
LIMITS
MONITORING REQUIREMENTS
Daily Average
Daily
Maximum
Measurement
Frequen
Sample Type
Sample Location
Flow
Weekly
_
Pump Logs or
Estimate
Effluent
Tempierature, OC
Weekly
Grab
Effluent
TSS, m /L
Monthly
Grab
Effluent
Total Arsenic, /L
Monthly
Grab
Effluent
Total Selenium, /L
Monthly
Grab
Effluent
Total Hardness, mg/L
Monthly
Grab
Effluent
Notes:
1. Please See Special Condition A. (23.).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 11 of 23

Permit NCO024406
A. (7.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 006)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning upon the commencement of operations of the new Lined Retention
Basin and lasting until expiration, the Permittee is authorized to discharge from Outfall 006 (new
lined retention basin). Such discharges shall be limited and monitored2 by the Permittee as specified
below:
PARAMETER
LIMITS
MONITORING REQUIREMENTS
Monthly
Avera a
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Flow, MGD
Weekly
Instantaneous
Effluent
Oil and Grease
15.0 m /L
20.0 m /L
Quarterly
Grab
Effluent
Total Suspended Solids
30.0 m /L
50.0 m /L
Quarterly
Grab
Effluent
H3
Weekly
Grab
Effluent
Total Arsenic, /L
Quarterly
Grab
Effluent
Total Mercury', n /L
Quarterly
Grab
Effluent
Total Selenium, /L
Quarterl
Grab
Effluent
Nitrate/nitrite as N, m /L
Quarterly
Grab
Effluent
Chlorides, /L
Quarterly
Grab
Effluent
Bromides, m /L
Quarterl
Grab
Effluent
Total Nickel, /L
Quarterly
Grab
Effluent
Sulfates, m /L
Quarterly
Grab
Effluent
Fluoride, /L
Quarterly
Grab
Effluent
Total Barium, m /L
Quarterly
Grab
Effluent
Total Chromium, /L
Quarterly
Grab
Effluent
Total Copper
1.0 m /L
1.0 m /L
Monthly
Grab
Effluent
Total Lead
16.9 /L
367.7 /L
Monthly
Grab
Effluent
Total Thallium
Quarterly
Grab
Effluent
Total Hardness, m /L
Quarterly
Grab
Effluent
Chronic Toxicity4
Quarterly
Grab
Effluent
Ammonia5
1.0 m /L
5.0 m /L
Daily
Grab
Effluent
Total Iron6
1.0 m /L
1.0 m /L
Quarterly
Grab
Effluent
Notes:
1. The facility shall use EPA method 1631E.
2. Please See Special Condition A. (23.).
3. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
4. Whole Effluent Toxicity shall be monitored by chronic toxicity (Ceriodaphnia) P/ F at 17.4%. See
Condition A. (14.) for details.
5. Ammonia limit and monitoring is only applicable in the event of the emergency release of anhydrous
ammonia.
6. The limit applies when the chemical metal cleaning waste is being discharged to the basin.
The facility shall complete and submit EPA Form 2C for this Outfall within 2 years of
commencement of the discharge.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
The facility shall use polymer addition as needed to achieve compliance with the permit limits
for the Lined Retention Basin.
Page 12 of 23

Pertnit NCO024406
A. (8.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall.
007)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge from Outfall 007 - Emergency spillway of the South Coal Pile
Basin. Such discharges shall be limited and monitored by the Permittee as specified below:
PARAMETER
LIMITS
I MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement Frequency
Sample
Type
Sample
Location
Flow, MGD
Waived
Estimate
Grab
Effluent
Effluent
H
Waived
TSS
Waived
Grab
Effluent
Oil and Grease
Waived
Grab
Effluent
The emergency spillway is designed for a flood greater than 100-year event in Stokes County.
Sampling of this spillway is waived due to unsafe conditions associated with sampling during
an overflow event.
Monitoring is required for any other rain event that might trigger a discharge.
A. (9.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Internal
Outfall 009)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge from Internal Outfall 009 (domestic wastewater plant). Such
discharges shall be limited and monitored' by the Permittee as specified below:
PARAMETER
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Flow, MGD
Weekly
Instantaneous
Effluent
_ BOD, 5-day, 201 C
30.0 ma/L
45.0 m /L
Weekly
Grab
Effluent
TSS
30.0 m /L
45.0 m /L
Weekly
Grab
Effluent
Fecal Coliform (geo. mean)
Notes:
200/100 mL
400/100 mL
Weekly
Grab
Effluent
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's
eDMR application system. Please See Special Condition A. (23.).
Page 13 of 23

Permit NCO024406
A. (10.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall
111)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge from Outfall 111 — Toe Drain Discharge. Such discharges shall
be limited and monitored) b\ the Permittee as specified below:
PARAMETER
LIMITS
! MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Fre uenc z
Sample
Type
Sample
Location
Flow, MGD
Monthly/QuarterlyMonthly/Quafterly
Estimate
Effluent
H3
Monthly/QuarterlyMonthlyQuarterly
Grab
Effluent
TSS
30.0 m /L
100.0 m /L
Month) /Quarterly
Grab
Effluent
Oil and Grease
15.0 m IL
20.0 m /L
Month) /Quarterly
Grab
Effluent
Fluoride, m /L
Monthl /Quarterly
Grab
Effluent
Total Mercur , n /L
12.0 n /L
12.0 n IL
Month l /Quarter)
Grab
Effluent
Total Barium, m IL
Month l /Quarter)
Grab
Effluent
Total Zinc, IL
Month l /Qu arterly
Grab
Effluent
Total Arsenic
10.0 IL
340.0 IL
Month l /Qu arterly
Grab
Effluent
Total Boron, /L
Month l IQuarterl
Grab
Effluent
Total Cadmium, /L
0.59 /L
3.24 /L
Monthly/QuarterlyMonthly/Quarterly
Grab
Effluent
Total Chromium, /L
Monthly/QuarterlyMonthly/Quarterly
Grab
Effluent
Total Copper, /L
Monthly/QuarterlyMonthly/Quarterly
Grab
Effluent
Total Thallium
Month l IQuarterl
Grab
Effluent
Total Lead, /L
Monthl /Quafterly
Grab
Effluent
Total Nickel, t, /L
Monthly/Quarterly
Grab
Effluent
Total Selenium
5.0 /L
56.0 /L
Month l /Quarterly
Grab
Effluent
Nitrate/nitrite as N, m IL
Month l /Quarterly
Grab
Effluent
Sulfates, m /L
Month l /Quarter)
Grab
Effluent
Bromides, m /L
Month l /Quarter)
Grab
Effluent
Chlorides
250.0 m IL
250.0 m /L
Month l IQuarterl
Grab
Effluent
TDS
500.0 m IL
500.0 m /L
Month l IQuarterl y
Grab
Effluent
Total Hardness, m /L
Month l IQuarterl
Grab
Effluent
Temperature, OC
Month l /Qu arterly
Grab P
—
Effluent
Conductivity, mho/cm
Monthly/QuarterlyMonthly/Quarterly
Grab
Effluent
Notes:
1. Please See Special Condition A. (23.).
2. The facility shall conduct monthly sampling from the effective date of the permit. After one year
from the effective date of the permit the monitoring will be reduced to quarterly.
3. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
4. The facility shall use EPA method 1631E.
If no discharge occurs during the reporting period or the Permittee is unable to obtain a
representative sample due to low -flow conditions at the seep, the Permittee shall submit its
DMR, as required, and indicate "No Flow" for the seep (15A NCAC 02B .0506(a)(1)(E)).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 14 of 23

Permit NCO024406
A. (11.) ADDITIONAL CONDITIONS AND DEFINITIONS
[NCGS 143-215.3 (a) (2) and NCGS 143-215.66]
1. EPA methods 200.7 or 200.8 (or the most current versions) shall be used for analyses of all
metals except for total mercury (EPA Method 1631E).
2. All effluent samples for all external outfalls shall be taken at the most accessible location after
the final treatment but prior to discharge to waters of the U.S. (40 CFR 122.416)).
3. The term low volume waste sources mean wastewater from all sources except those for which
specific limitations are otherwise established in this part (40 CFR 423.11 (b)).
4. The term chemical metal cleaning waste means any wastewater resulting from cleaning any
metal process equipment with chemical compounds, including, but not limited to, boiler tube
cleaning (40 CFR 423.11 (c)).
5. The term metal cleaning waste means any wastewater resulting from cleaning [with or
without chemical cleaning compounds] any metal process equipment including, but not
limited to, boiler tube cleaning, boiler fireside cleaning, and air preheater cleaning (40 CFR
423.11 (d)).
6. For all outfalls where the flow measurement is to be estimated" the estimate can be done by
using calibrated V-notch weir, stop -watch and graduated cylinder, or other method approved
by the Division.
7. The term "FGD wet scrubber wastewater" means wastewater resulting from the use of the flue -
gas desulfurization wet scrubber.
8. There shall be no discharge of polychlorinated biphenyl compounds.
9. The permittee shall report the presence of cenospheres observed in any samples on the DMRs
in the comment section.
10. The applicant is permitted to discharge chemical metal cleaning wastes to the ash basin.
11. Nothing contained in this permit shall be construed as a waiver by the permittee of any right
to a hearing it may have pursuant to State or Federal laws and regulations.
A.- (12.) BOILER CLEANING WASTES
[40 CFR 423]
It has been demonstrated that under certain conditions it is possible to reduce the concentration of
metals in boiler cleaning wastes in the range of 92-99+ percent by treatment in ash ponds. Because
of dilution problems and the existence of boundary interface layers at the extremities of the plume, it
is difficult to prove beyond doubt that the quantity of iron and copper discharge will always be less
than one milligram per liter times the flow of metal cleaning when treated in this manner.
The application of physical/chemical methods of treating wastewater has also been demonstrated to
be effective in the treatment of metal cleaning wastes. However, the effectiveness of ash pond
treatment should be considered in relation to the small differences in effluent quality realized
between the two methods.
It has been demonstrated that the presence of ions of copper, iron, nickel and zinc in the ash pond
waters was not measurably increased during the ash pond equivalency demonstration at the Duke
Energy's Belews Creek Steam Station. Therefore, when the following conditions are implemented
during metal cleaning procedures, effective treatment for metals can be obtained at this facility:
1. Large ash basin providing potential reaction volumes in the ratio of 100 to 1.
2. Well-defined shallow ash delta near the ash basin influent.
3. Ash pond pHs of no less than 6.5 prior to metal cleaning waste addition.
4. Four days retention time in ash pond with effluent stopped.
5. Boiler volume less than 86,000 gallons.
6. Chemicals for cleaning to include only one or more of the following:
a. Copper removal step- sodium bromate (NaBr02), ammonium carbonate ((NH4)2CO3-H2O,
and ammonium hydroxide (NH40H).
Page 15 of 23

Permit NCO024406
b. Iron removal step - hydrochloric acid (HCI), ammonium bifluoride ((NH4)HF2 and
proprietary inhibitors.
7. Maximum dilution of wastewater before entering ash pond: 6 to 1.
8. If monitoring of basin effluents (as required by the permit) after treatment of metal cleaning
wastes reveals discharges exceed the limits of the permit, Permittee will:
1) re -close the basin discharge,
2) conduct such in -basin sampling as necessary to determine the cause of
nonconformance,
3) take appropriate corrective actions, and
4) file a report with EPA including all pertinent data.
A. (13.) SPECIAL CONDITION FOR ASH POND DISCHARGE
[40 CFR 4231
Beginning on the effective date of this permit and lasting until expiration, there shall be no discharge
of plant wastewater to the ash pond unless the Permittee provides and maintains at all times a
minimum free water volume (between the top of the sediment level and the minimum discharge
elevation) equivalent to the sum of the maximum 24-hour plant discharges plus all direct rainfall and
all runoff flows to the pond resulting from a 10-year, 24-hour rainfall event, when using a runoff
coefficient of 1.0. During the term of the permit, the Permittee shall remove settled material from the
ponds or otherwise enlarge the available storage capacities in order to maintain the required
minimum volumes at all times. The Permittee shall determine and report to the permit issuing
authority the following on an annual basis:
1) the actual free water volume of the ash pond,
2) physical measurements of the dimensions of the free water volume in sufficient detail to allow
validation of the calculated volume, and
3) a certification that the required volume is available with adequate safety factor to include all
solids expected to be deposited in the pond for the following year.
Present information indicates a needed volume of 86.2 acre-feet in addition to solids that will be
deposited to the ash pond; any change to plant operations affecting such certification shall be
reported to the Director within five days.
NOTE: In the event that adequate volume has been certified to exist for the term of the permit,
periodic certification is not needed.
A. (14.) CHRONIC TOXICITY PASS/ FAIL PERMIT LIMIT
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant
mortality to Ceriodaphnia dubia at an effluent concentration of 90% for Outfall 003 and Outfall
003A, 3.7% for Outfall 006A dewatering, and 17.4% for Outfall 006.
The permit holder shall perform at a minimum, monthlu monitoring for Dewatering (Outfall 006) and
quarterly monitoring for Decanting/Normal operation (Outfalls 003/003A/006) using test procedures
outlined in the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised
December 2010, or subsequent versions or "North Carolina Phase II Chronic Whole Effluent Toxicity
Test Procedure" (Revised- December 2010) or subsequent versions. Effluent sampling for this testing
must be obtained during representative effluent discharge and shall be performed at the NPDES
permitted final effluent discharge below all treatment processes.
If the monthly/quarterly test procedure results in a failure or ChV below the permit limit,
then multiple -concentration testing shall be performed at a minimum, in each of the two
following months as described in "North Carolina Phase II Chronic Whole Effluent Toxicity
Test Procedure" (Revised -December 2010) or subsequent versions.
Page 16 of 23

Permit NCO024406
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the
parameter code TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally,
DWR Form AT-3 (original) is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than
30 days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and
all concentration/response data, and be certified by laboratory supervisor and ORC or approved
designate signature. Total residual chlorine of the effluent toxicity sample must be measured and
reported if chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the permittee will complete the information located at the top of the aquatic toxicity (AT)
test form indicating the facility name, permit number, pipe number, county, and the month/year of
the report with the notation of "No Flow" in the comment area of the form. The report shall be
submitted to the Water Sciences Section at the address cited above. Should the permittee fail to
monitor during a month in which toxicity monitoring is required, monitoring will be required during
the following month. Assessment of toxicity compliance is based on the toxicity testing month.
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Water Resources indicate potential impacts to the receiving stream, this permit may be
re -opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival, minimum control organism reproduction, and appropriate environmental
controls, shall constitute an invalid test and will require immediate follow-up testing to be
completed no later than the last day of the month following the month of the initial monitoring.
A. (15.) BIOCIDE CONDITION
[NCGS 143-215.1]
The permittee shall not use any biocides except those approved in conjunction with the permit
application. The permittee shall notify the Director, in writing not later than ninety (90) days prior to
instituting use of any additional biocide used in cooling systems which may be toxic to aquatic life
other than those previously reported to the Division of Water Resources. Such notification shall
include completion of Biocide Worksheet Form 101 and a map locating the discharge point and
receiving stream. Completion of Biocide Worksheet Form 101 is not necessary for those outfalls
containing toxicity testing. Division approval is not necessary for the introduction of new biocides into
outfalls currently tested for whole effluent toxicity.
A. (16.) CLEAN WATER ACT SECTION 316 (B)
[40 CFR 125.95]
The permittee shall comply with the Cooling Water Intake Structure Rule per 40 CFR 125.95. The
permittee shall submit all the materials required by the Rule 3.5 years from the effective date of the
permit.
Page 17 of 23

Permit NCO024406
Copies of all the study plans, study results, and any other applicable materials should be submitted
to:
1) Electronic Version Only (pdf and CD)
Division of Water Resources
WQ Permitting Section - NPDES
1617 Mail Service Center
Raleigh, NC 27699-1617
2) Electronic Version (pdf and CD) and Hard Copy
Division of Water Resources
Water Sciences Section
1621 Mail Service Center
Raleigh, NC 27699-1621
Based on 40 CFR 125.92 (c) and 40 CFR 125.94 (c) & (d), the Director has determined that operating
and maintaining the existing closed -cycle recirculating system meets the requirements for a
provisional BTA. The final determination will be made upon review of the materials submitted by the
permittee. This determination does not preclude the Division from implementing additional
requirements to minimize impingement and entrainment of the aquatic organisms based on the
results of the studies.
The facility shall continue to demonstrate that make-up water withdrawals attributed specifically to
the cooling portion of the cooling system have been minimized.
Nothing in this permit authorizes take for the purposes of a facility's compliance with the Endangered
Species Act.
A. (17.) STRUCTURAL INTEGRITY INSPECTIONS OF ASH POND DAMS
[15A NCAC 02K.0208]
The facility shall meet the dam design and dam safety requirements per 15A NCAC 2K.
A. (18.) FISH TISSUE MONITORING NEAR ASH POND DISCHARGE (Outfall
003/006)
[NCGS 143-215.3 (a) (2)]
The facility shall conduct fish tissue monitoring annually and submit the results with the NPDES
permit renewal application. The objective of this monitoring is to evaluate potential uptake of pollutants
by fish tissue near the ash pond discharge. The parameters analyzed in fish tissue shall include
arsenic, selenium, and mercury. The monitoring shall be conducted in accordance with the sampling
plan approved by the Division. The plan should be submitted to the Division within 180 days from the
effective date of the permit. Upon approval, the plan becomes an enforceable part of the permit.
Copies of all the study plans, study results, and any other applicable materials should be submitted
to:
1) Electronic Version Only (pdf and CD)
Division of Water Resources
WQ Permitting Section - NPDES
1617 Mail Service Center
Raleigh, NC 27699-1617
2) Electronic Version (pdf and CD) and Hard Copy
Division of Water Resources
Water Sciences Section
1621 Mail Service Center
Page 18 of 23

Permit NCO024406
Raleigh, NC 27699-1621
A. (19.) PUMPING FROM DAN RIVER INTO BELEWS LAKE
[NCGS 143-215.1]
The Division recognizes the additional cooling water demand on Belews Lake associated with new
scrubbers. The operation of a permanent pump station and cooling water intake structure, receiving
water pumped from the Dan River to Belews Lake, is hereby authorized under the following
conditions:
• Pumping must not lower the flow in Dan River below 110 cfs, which is the Division of Water
Resources target flow recommendation for this site. River flow at the pumping location must
be checked at a newly installed USGS gauge station near the old USGS Pine Hall gauge
station prior to each daily pumping event.
• The Dan River pumps intake will be positioned above the river bottom and have an approach
velocity less than or equal to 0.5 feet/ second at the inlet of the velocity caps and at the 2mm
fine mesh traveling screens to minimize fish entrainment and impingement.
• The withdrawal location will be near the confluence of the spillway channel below Belews
Lake Dam and the Dan River. This is a scoured bottom area that does not provide suitable
aquatic habitat.
• The facility will perform routine semi-annual lake monitoring to assess limnological
conditions in Belews Lake.
• Pumping may occur to 'a maximum water level in Belews Lake of 724.5 feet msl.
• Pumping must not occur from April 1 through June 30 of any year, in order to avoid the fish
spawning period.
• At least 80% of ambient flow as recorded at the new Pine Hall USGS gauge must be bypassed
(i.e., withdraw no more than 20% of flow).
This approval allows the operation of two 50 cfs velocity caps, a permanent settling pond with
approximately 6000 square feet of surface area, a 4-pump pumping station with a capacity not to
exceed 100 cfs, force main, an electrical substation with an access road, and a diffuser in Belews
Lake. Please note that this authorization does not affect the legal requirements to obtain other
permits or approvals which may be required for this activity by the Division of Water Resources or
other agencies, including the Division of Land Resources, or the US Army Corps of Engineers. The
Division reserves the right to reopen this permit in the event of unforeseen negative environmental
impacts due to this pumping operation.
A. (20.) BROMIDE REDUCTION EVALUATION
[NCGS 143-215.1]
Duke Energy shall investigate technical solutions to reduce bromide in the discharge from Outfall
003, 006, and 111. Duke Energy shall submit semi-annual reports on the efforts it undertakes to
reduce bromide at the source as well as efforts at downstream water treatment plants to reduce
formation of total trihalomethanes (TTHM). Duke Energy shall continue to work with the downstream
public water supply systems to find a solution to the issue of the TTHM formation in the distribution
system of the downstream water systems. The semi-annual status reports (3 copies) shall be
submitted to the Division of Water Resources, Complex NPDES Permitting Unit.
In the event of a Maximum Contaminant Level (MCL) violation for Total Trihalomethanes (THMs) at
the Town of Madison, the City of Eden or any wholesale customers of those systems, Duke Energy
will within 14 days of the request provide the latest available bromide monitoring data that can be
incorporated into required Public Notices issued by the public water system(s).
Page 19 of 23

Permit NCO024406
A. (21.)DOMESTIC WASTEWATER TREATMENT PLANT
[NCGS 143-215.11
The domestic wastewater treatment plant shall be properly operated and maintained to ensure
treatment of domestic wastewater to secondary levels.
A. (22.) INSTREAM MONITORING (Outfall 003)
[15A NCAC 02B.0500 ET SEQ.]
The facility shall conduct monthly instream monitoring (approximately 2.7 miles upstream at the
Highway 311 bridge and approximately 250 meters downstream of the ash pond discharge in Dan
River) for total arsenic, total selenium, total mercury, total chromium, dissolved lead, dissolved
cadmium, dissolved copper, dissolved zinc, total bromide, total hardness (as CaCO3), temperature,
turbidity, and total dissolved solids (TDS). The monitoring results shall be reported on the facility's
Discharge Monitoring Reports and included with the NPDES permit renewal application.
The facility shall also conduct instream monitoring of the Unnamed Tributary downstream of the
discharges from Outfalls 003, 003A and 111, sampling shall be conducted at the culvert just to the
north of Middleton loop road. The monitoring can be discontinued upon cessation of the discharge
from all three outfalls. The monitoring parameters shall include total arsenic, total selenium, total
mercury, total chromium, dissolved lead, dissolved cadmium, dissolved copper, dissolved zinc, total
bromide, total hardness (as CaCO3), temperature, turbidity, pH, chlorides, and total dissolved solids
(TDS). The monitoring results shall be reported on the facility's Discharge Monitoring Reports and
included with the NPDES permit renewal application.
A. (23.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and
program reports. The final NPDES Electronic Reporting Rule was adopted and became effective on
December 21, 2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this
permit (Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.)
• Section D. (6.)
• Section E. (5.)
Reporting
Records Retention
Monitoring Reports
1. Reporting Requirements [Supersedes Section D. f2.1 and Section E. 15.1 fall
The permittee shall report discharge monitoring data electronically using the NC DWR's
Electronic Discharge Monitoring Report (eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month
and submitted electronically using eDMR. The eDMR system allows permitted facilities to enter
monitoring data and submit DMRs electronically using the internet. Until such time that the
state's eDMR application is compliant with EPA's Cross -Media Electronic Reporting Regulation
(CROMERR), permittees will be required to submit all discharge monitoring data to the state
electronically using eDMR and will be required to complete the eDMR submission by printing,
signing, and submitting one signed original and a copy of the computer printed eDMR to the
following address:
Page 20 of 23

Permit NCO024406
NC DENR / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the
facility being physically located in an area where less than 10 percent of the households have
broadband access, then a temporary waiver from the NPDES electronic reporting requirements
may be granted and discharge monitoring data may be submitted on paper DMR forms (MR 1,
1.1, 2, 3) or alternative forms approved by the Director. Duplicate signed copies shall be
submitted to the mailing address above. See "How to Request a Waiver from Electronic
Reporting" section below.
Regardless of the submission method, the first DMR is due on the last day of the month following
the issuance of the permit or in the case of a new facility, on the last day of the month following
the commencement of discharge.
Starting on December 21, 2020, the permittee must electronically report the following
compliance monitoring data and reports, when applicable:
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports; and
• Clean Water Act (CWA) Section 316(b) Annual Reports.
The permittee may seek an electronic reporting waiver from the Division (see "How to Request a
Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at the
time of each electronic submission. The permittee should use the EPA's website resources to
identify the initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity
(EPA or the state authorized by EPA to implement the NPDES program) that is the designated
entity for receiving electronic NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for
each type of electronic submission and for each state. Instructions on how to access and use the
appropriate electronic reporting tool will be available as well. Information on EPA's NPDES
Electronic Reporting Rule is found at: htto:llwww2.epa.gov/compliance/final-national-
i rollutant-discharge-elimination-sy stem-npdes-electronic-reporting-rule.
Electronic submissions must start by the dates listed in the "Reporting Requirements" section
above.
3. How to Request a Waiver from Electronic Re ortin
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an
electronic reporting waiver, a permittee must first submit an electronic reporting waiver request
to the Division. Requests for temporary electronic reporting waivers must be submitted in writing
to the Division for written approval at least sixty (60) days prior to the date the facility would be
required under this permit to begin submitting monitoring data and reports. The duration of a
temporary waiver shall not exceed 5 years and shall thereupon expire. At such time, monitoring
data and reports shall be submitted electronically to the Division unless the permittee re -applies
Page 21 of 23

Permit NCO024406
for and is granted a new temporary electronic reporting waiver by the Division. Approved
electronic reporting waivers are not transferrable. Only permittees with an approved reporting
waiver request may submit monitoring data and reports on paper to the Division for the period
that the approved reporting waiver request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found
on the following web page:
httpl deg. nc.govIabout/ divisions Iwater-resources /edmr
4. Signatory Requirements [Supplements Section B. 111.1 Ib) and Supersedes Section B. 111.
La
All eDMRs submitted to the permit issuing authority shall be signed by a person described in
Part II, Section B. (11.)(a) or by a duly authorized representative of that person as described in
Part II, Section B. (11.)(b). A person, and not a position, must be delegated signatory authority
for eDMR reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North
Carolina's eDMR system, registering for eDMR and obtaining an eDMR user account, please visit
the following web page:
http: / L deq.nc.gov/ about/ divisions/ water -resources/ edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall
make the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION
WILL BE ACCEPTED:
7 certify, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief, true, accurate,
and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations. "
5. Records Retention [Supplements Section D. 16.11
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR
submissions. These records or copies shall be maintained for a period of at least 3 years from
the date of the report. This period may be extended by request of the Director at any time [40
CFR 122.411.
A. (24.) THERMAL VARIANCE
[40 CFR 125, Subpart H]
In order to continue the Thermal Variance beyond the term of this permit the facility shall develop
and conduct comprehensive 316(a) studies. The 316(a) studies shall be performed in accordance with
the Division of Water Resources approved plan. The temperature analysis and the balanced and
indigenous study plan shall conform to the specifications outlined in 40 CFR 125 Subpart H and the
EPA's Draft 316(a) Guidance Manual, dated 1977, and the Region 4 letter to NCDENR, dated June 3,
2010.
The study shall be performed in accordance with the following schedule:
Page 22 of 23

Permit NCO024406
1) Effective date of the permit +60 days - submit the Draft Study Plan to the DEQ and EPA, the
DEQ will perform the Plan review and provide the comments to Duke within 30 days of the
Plan receipt.
2) Effective date of the permit +120 days - meet with the DEQ to provide responses to the
DEQ/EPA comments and discuss the Study Plan.
3) Effective date of the permit +150 days - submit the Final Study Plan to the DEQ and to the
EPA.
4) After obtaining an approval of the Study Plan, conduct 1 year of the monitoring.
5) 120 days after completing the monitoring, submit the study results and application to
continue the 316a variance to DEQ.
Copies of all the study plans, study results, and any other applicable materials should be submitted
to:
1) Electronic Version Only (pdf and CD)
Division of Water Resources
WQ Permitting Section - NPDES
1617 Mail Service Center
Raleigh, NC 27699-1617
2) Electronic Version (pdf and CD) and Hard Copy
Division of Water Resources
Water Sciences Section
1621 Mail Service Center
Raleigh, NC 27699-1621
A. (25.) COMPLIANCE BOUNDARY
[15A NCAC 02L.0107]
The compliance boundary for the disposal system shall be specified in accordance with 15A NCAC
02L .0107(a) or (b) dependent upon the date permitted. An exceedance of groundwater standards at
or beyond the compliance boundary is subject to remediation action according to 15A NCAC 02L
.0106(c), (d), or (e) as well as enforcement actions in accordance with North Carolina General Statute
143-215.6A through 143-215.6C. The compliance boundary map for this facility is incorporated
herein and attached hereto as Attachment A.
A. (26.) APPLICABLE STATE LAW (State Enforceable Only)
[NCGS 143-215.1(b)]
This facility shall meet the General Statute requirements under NCGS § 130A-309.200 et seq. This
permit may be reopened to include new requirements imposed under these Statutes.
Page 23 of 23

NCO024406 - Belews Creek Steam Station
Latitude (0011
36°16'49.5" Receivin Stream 001 005 007 : Belews Lake, class
Longitude (001):
80°03'39.8" Receiving Stream t003^ 111 1: UT to Dan River,
Latitude (003);
36018'22.0" Class WS-N
Longitude(003):
80°04'50.7" Receiving Strea ni006k Dan River,
Latitude 005 :
36°17'50.3"Latitude(006): 36°18'34.8"
Longitude(005):
8003'29.7" Longitude(006): 80004'36.1"
` Facility
l Location MF
NO rt Duke Energy- Belews Steam Station
NCO024406
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